Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd4b736c062133c…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 16:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4947a0154ad6d600fd34097dd51c4b4 SHA-1: 9b77dfb00a466e523d967d08a130a26f984be3e7 SHA-256: afd4b736c062133ce8cde3e14e40b6c7440e3cff56dc476c3dde64e9fae687da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://delve-cr.com/uploads/gekapamenela.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/73339946725.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005c622112---lirukubusibegabotogudetav.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/43240915717.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/bilefofeviraz.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e164a22970c0b1b8bd069c75ad109271/58778850116.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f138e5e36---67099373624.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3at8th0l36l95psqfkrlrgdiu1/68450881221.pdfIn PDF document text
    • http://crm333.com/documentos/file/83504957008.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa68c6122e---87130151750.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/74340476975.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/68147005947.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/19075596549.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f7a2d7beb6e17ebee3164724336fac82/giwaku.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/30362836717.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/foxanemadase.pdfIn PDF document text
    • http://jsdarvin.com/files/panav.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bc821f79---43318297041.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cda7735f5db3284b40f324784b80d2c6/16687875905.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7d746751b33df00685584994d74b2592/risipopew.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16113c826037a7---88579353372.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c50de889fdae2ca47fdc64aab3b9e181/19132314688.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/74749348111.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/87505996383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+turn+off+imessage+when+changing+to+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 11052 bytes
SHA-256: 0081d9de530adc9241776e41c576682942273008ed020905302cd63dbc6cbed8
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 18080 bytes
SHA-256: c3f8e49e1745ceeb0d8db62a99dd4e0f9a5b9ae8eccbe3f08735b44390ed8872

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